bug#81587: c-ts-mode narrowing disturbs the indirect buffer

> From: Tomas Nordin <[email protected]>
> Date: Sun, 09 Aug 2026 10:08:13 +0000
> 
> Hello
> 
> Using c-ts-mode, cloning the buffer, narrowing the direct buffer, doing
> some navigation in the indirect buffer, seem problematic. Like this for
> example:
> 
> $ emacs -Q lib-src/asset-directory-tool.c
> 
> M-x c-ts-mode
> C-s main_1 RET
> C-x 4 c
> C-x o
> C-x n d
> C-x o
> 
> We should now be in the indirect buffer after having narrowed the
> main_1() function in the direct buffer.
> 
> Do some C-M-e and C-M-a and shortly observe
> 
> Error running timer ‘show-paren-function’: (args-out-of-range 3271)
> 
> If I skip the 'M-x c-ts-mode' step the problem is not reproduced.

The doc string of treesit-parser-create says:

  If that buffer is an indirect buffer, its base buffer is used instead.
  That is, indirect buffers use their base buffer's parsers.  Lisp
  programs should widen as necessary should they want to use a parser in
  an indirect buffer.

Yuan, any comments or suggestions?